I know I asked about alternate mapping methods earlier, but here goes again.
TriPlanar Projection allows artists to project textures on all 3 axes. Currently, only the Z axis is supported in World Machine which makes texturing strata, or vertical faces, impossible. IMO, World Machine badly needs this and if included would make it extremely powerful.
Here is a link regardin triplanar projection in CPU Gems 3, with source code:
http://http.developer.nvidia.com/GPUGems3/gpugems3_ch01.html
Scroll down to Section 1.5 “Texturing and Shading”